Poisson’s ratio (v13) (3D fiber) result

The Poisson’s ratio (v13) result is generated from a Fiber orientation Pack analysis using 3D analysis technology.

Using this result

The Poisson’s ratio (v13) result indicates the strain in the third principal direction caused by the stress in the first principal direction. In general, vij = Poisson’s ratio for transverse strain in the j-direction when stressed in the i-direction.

The Poisson’s ratio (v13) result is recorded for each tetrahedral element in the model at the end of the analysis.

Tip: Click New PlotResults tab > Plots panel > New Plot and under Plot type click Path plot so that you can view the Poisson’s ratio distribution with respect to the model geometry.

Orthotropic assumption

The thermo-mechanical property calculation for fiber-filled composites are based on the orthotropic assumption, that fiber-filled material properties are different in three orthogonal principal directions. Under this assumption, there are 9 independent mechanical constants and three independent thermal expansion coefficients.

The Orthotropic set option selects the 9 mechanical constants (E1, E2, E3, v12, v23, v13, G12, G23, G13) and 3 CTE’s (thermal expansion coefficient in first/second/third directions) all at once. In a Fiber analysis, the complete set of thermo-mechanical properties with orthotropic assumption is necessary for a Warp analysis using 3D analysis technology. These properties are element-based, so each tetrahedral or beam element has its own orthotropic set of properties.
Note: To access the Orthotropic set option, ensure that you have selected an analysis sequence that includes Fill+Pack.
  1. Click Process SettingsHome tab > Molding Process Setup panel > Process Settings. The Process Settings Wizard dialog opens.
  2. If necessary, click Next until you reach the Fill+Pack Settings page of the Wizard.
  3. Select the option Fiber orientation analysis if fiber material, and then click Fiber parameters. The Fiber Orientation Solver Parameters dialog opens
  4. Click Composite property calculation options, and then from the Fiber-filled property output drop-down list, select Orthotropic set.
Parent topic: Fiber Orientation analysis results